Engine-cranking device.



C.y V. POLLOGK. ENGINE GBANKING DEVICE. I

APPLICATION FILED 111111122. 1910.

Patented Mali?, 1911.

UNiTD STATES Parana) oFFIoE.

UHELES VERT-BEES-E PIOLLOCK, OF MADISON, WISCONSIN.

ENGINE-CRANKING DEVICE.

- specification.

My n'vention relates to improvements in engine crankingdevices and has for its object to provide a new and improved device whereby ,the engine'might 'be cranked but which will release in case of a premature explosion in the engine cylinder.

Fig 1.

' AFigure 1 is a front elevation of the crank: liigl is a part sectlon on the line Q-f?. of

Like` arts are indicated by like letters throughout the several figures.

The shaft having the collar A integral therewith has the squared portions MVA. and the cylindrical portion A* andtcrmiv nates in the s.rewt hreaded.part M'.- Ihe disk B has the centrally located square h'tlc B to engage'thepart A2 and the concave. surface Bz'extending from the'periphcry of the disk to thc depression li" about. the hole.

Bl. `The disk C ias the. square hole C' to I engage the part A and concave surface. (l:

extending from the periphery of the disk to the centrally located depression C". 'l-he flat disk l) 'provided with the circular hole D -to engage the part A, is provided on either side with thc lcprcssions DL', and has projecting therefrom the arm D upon which is mounted thel handle The nut ll engages tbe scrmv-,tbread A5. to compress the disks B, C and l) between the washer ll and col lar A.

The shaft A its providcdrat one end willi the clutch F which is adapted to engage tbc end of the engine shaftl"l when the crank is rotated to start the engine. i

The use and operation of my invention are as follows: Upon the engine shaft vI mount .a pluralit7 of conca'ved disks in such manner that they are rotated positively thereby. Between these disks ,I place a further iiat diskV which is rotatably mounted upon the shaft. This disk is provided with an arm and handle and by adjusting by means of a nut or other mechanism, the pressurebetween the concaved disks which ro. tate with the shaft and the Het disk which Specittcation o! Letters Patent. Application filed :une 22, 1910. serial No. item44.

Patented Mar. 7, 191:1.

does not rotate, a suitable connection ,may

be had between the engine and the crank in order that.- the engine may be turned by means of the crank but that the crank may Slip in case a prennltnre explosion should reverse the engine. I provide conca vcd disks since l tind that. the pressure required is less-and the friction is applied near the pcripher'v of the disk rather-tintin near the shaft where the mechanical leverage is smaller.

1. A n engine cranking device comprising :i hand-held operating portion, in combination with an engine rod driving portion and slidablc concave disk connections between them.

Q. An cnginc cranking devicecomprising a hand-held portion. in combination with an engine rod driving portion having concave friction disks-thereon forming a slidable connection between them.

"3. A\n cngine cranking device. comprising a hand-held portion. consisting of a hand mountcd upon said sha ft and concave disks in frictional engagement. with said Ilat disk.

.\.n cnginc cranking device comprising a shaft. adhd hand-operated disk rotalablv mounted unon said shaft and concave disks in frictional engagementwith said tial disk, said disks rigidly mounted upon said shai't.

(i. An engine. cranking device. comprising a shaft. a flat li:nnl-o}u|'atcd disk 'rotatably4 mounted upon said shaft. and concave disks in friclional cngagcmcnl. with said flat disk, and lmeans for adjusting the friction bctwccu said disks.

7. An cnginc. cranking device comprising a shaft. a dlathamlo|wrattal disk rotatably mounted upon said shaft= and concave disks in frictional engagement. with said tlat disk, said disks rigidlv mounted upon said shaft and means for adjusting the friction be. tween said disks. i

lS. An engine cranking device comprising a siiaft, a flat hand-ope'ated disk rotatably mounted upon said shaft and concave disks in friction-al engagement with said fiat disk,

said disks provided with centr'l'IyV-,located orations 4being squarel in'c'ross seption und openings angular in` cross section1 to' engage adapted tolenggehori'sponding signage sur- 10 corresponding portions f the 5shafiz.-

" faces'upo the shaft.

J, An engme cranking devlce comprising CHARLES VERTREESE POLLOCK' :1. shaft, a fiat hand-operated disk rotatablyy 1 mounted upon said L.haft and concave-disks Witnesses: in fri'ctional engagement with saidat disk,' .CHARLES G. RILEY,

said disks centrally perforated, said per- ISABELLE FLECKENSTEIN. 

